QoS Issues and Enhancements for IEEE 802.11 Wireless LAN

Qiang Ni 1 Lamia Romdhani 1 Thierry Turletti 1 Imad Aad 1
1 PLANETE - Protocols and applications for the Internet
Inria Grenoble - Rhône-Alpes, CRISAM - Inria Sophia Antipolis - Méditerranée
Abstract : Quality of Service (QoS) is a key problem of today's IP networks. Many frameworks (IntServ, DiffServ, MPLS, Traffic engineering, etc.) have been proposed to provide service differentiation in the Internet. At the same time, the Internet is becoming more and more heterogeneous due to the recent explosion of wireless networks. In wireless environments, bandwidth is scarce and channel conditions are time-varying and sometimes highly lossy. Many previous research works show that what works well in a wired network cannot be directly applied in the wireless environment. IEEE 802.11 wireless LAN (WLAN) is the most widely used WLAN standard today, but it cannot provide QoS support for the increasing number of multimedia applications. Thus, a large number of 802.11 QoS enhancement schemes have been proposed, each one focusing on a particular mode. This report summarizes all these schemes and presents a survey of current research activities. First, we analyze the QoS limitations of IEEE 802.11 wireless MAC layers. Then, different QoS enhancement techniques proposed for 802.11 WLAN are described and classified along with their advantages/drawbacks. Finally, the upcoming IEEE 802.11e QoS enhancement standard is introduced and studied in detail.
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Qiang Ni, Lamia Romdhani, Thierry Turletti, Imad Aad. QoS Issues and Enhancements for IEEE 802.11 Wireless LAN. [Research Report] RR-4612, INRIA. 2002. ⟨inria-00071973⟩

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